I used a company that was recommended by a friend. Mine do not have the ability to close in the down position, only up. That prevents them from blocking the sun so, no. Mine do not serve as light blockers. I’ve also had a problem with the screws popping out and had the company come back for adjustments. They ended up removing them and I had paper shades for 2 weeks. The screws still pop out. I don’t want to bash the company I used, but if I had to do it again I would buy them elsewhere.
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